Réponse :
1) All Three pictures seems to show people, family maybe, going on a trip, or camping.
2)
a) This picture shows us someone who seems to be jumping from the side with, "High school" written on it, to the one with the word "college" written on it. the person is between those 2 sides wich is what is called the "gap year"
b) I think a gap year is the year beetween high school to college, in wich people usuallly go on a trip before graduading to college.
Explications :
les explications sont dans les réponses, n'hésite pas à utiliser reverso si tu veux traduire c'que tu ne comprends pas.